On the Myology of the Chimpanzee &c. 341 



XLIV. — On some points in the Myology of the Chimpanzee and 

 others of the Primates. Bj Alexander Macalistek, 

 Professor of Zoology and Director of the Museum, Univer- 

 sity of Dublin. 



A YOUNG female Chimpanzee was purchased by the Rev. Dr. 

 Haughton for the Dublin Zoological Gardens during the past 

 year ; she was in feeble health, and after a short time died ; 

 and a very careful dissection of her body was made by Dr. 

 Haughton and myself. As this species has been frequently 

 dissected, and as records of its anatomy have been published 

 by Vrolik (E,echerches d'Anat. Comparee sur le Chimpanse, 

 1841, Amsterdam), Prof. Jeffrys Wyman (Proc. Boston Soc. 

 of Nat. Hist. Nov. 21, 1855, vol. v.), Burt G. Wilder (Boston 

 Journ. of Nat. Hist. 1862, vol. vii. No. 3. p. 352), Prof. Huxley 

 (Med. Times & Gazette, 1864, p. 429), Prof. Humphry (Journ. 

 Anat. & Phys. 1867, vol. i. p. 254), there is no necessity to 

 refer to any of the structural points in which my dissection 

 agrees with those already published. I will content myself 

 with noticing such points as either have escaped the attention 

 of these authors, or in which the animal dissected by us dif- 

 fered from those previously examined. 



The poor creature was suffering from an extensive necrosis 

 of the lower jaw ; and this prevented us from observing the 

 natural arrangement of the parts in this locality. 



The occipito-frontalis was very thin and weak. Wilder 

 found the fleshy fibres seemingly to meet at the vertex, both 

 from the occipital and frontal bellies ; this I did not notice, 

 but found it arranged as in man. This is interesting ; for I 

 have elsewhere recorded the occurrence of a continuity of the 

 occipital and frontal bellies of this muscle as a rare anomaly 

 in man. The occipital belly was thicker than the frontal. I 

 have found an occipito-frontal in every quadruman which I 

 have dissected. In the Orang, Tyson and Traill state that 

 they could not find it ; but Prof. Owen traced it distinctly in 

 this animal. The commonest form of occipito-frontalis in 

 Quadrumana, I think, is that described by Dr. Wilder ; for I 

 have found it in Ateles paniscus^ Macacus cynomolguSj Cehus 

 capucinus, Cercojnthecus sabceus^ Cynocephalus porcarius and 

 hamadryas. 



The retrahens aurem was split into two in the manner that 

 most commonly occurs in man 5 and it received a slip from the 

 trausversus nuchse, which arose as usual from the middle line 

 of the occipital bone, and passed outwards, overlying the tra- 

 pezius ; it crossed the occipital artery and occipitalis-minor 

 nerve. This muscle was found by Prof. Franz E. Schultze, 



